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  1. #1

    Default Maybe a dumb question

    But can my knock sensors being bad rob me of fuel efficiency or make my O2 sensors read faults?

    Dont want to have to dig into the truck too much as that stuff costs money. But so does gas.



    If at first you don't succeed, get a bigger cheater bar.

    Current:
    1999 GMC Sierra SLT Z71 | 5.3 "Vortec" | Spectre "Cold Air Intake" | TransDapt TBS | Hypertech 30005 Tune | 2005 Chevy Tail Lights | Denali headlights | Grill Mounted Fog Lights | AWS Bug Shield | 265/70/16 Futura Scramblers | Boss HD Speakers | 2005 Overhead Console | Flowmaster Super 40 mufflers 2N1O | Mostly stock-ish
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  2. #2

    Default

    Yes. The knock sensors are an important part of the ignition system, and their proper functioning helps the computer to adjust spark timing, so that a more complete burn of the fuel can happen. With bad knock sensors, you could not be completely burning the fuel, which can damage the O2 sensors, and then cause them to fault, making the gas mileage even worse.

  3. #3

    Default

    Exactly the news I was looking for... New project for the week. @Sierraowner5.3?

  4. #4

    Default

    Dumb question follow-up: how long do knock sensors usually last or what is a good interval to change them?
    Clint (TX) 2001 Silverado LS 4.8L auto 2wd ECSB [GARAGE]
    Gasoline or gunpowder: If you ain't burning one, you ain't having fun!
    NRA Endowment Member 5 24 48 88 - Hendrick Motorsports FTW!

  5. #5

    Default

    I always thought when they throw codes. Water likes to get under the intake. Come to think of it I gotta change the head gaskets anyway so...

  6. #6

    Default

    im more or less one armed right now, but i will help with what i can.

    Alex


    2011 GMC Sierra SLE 5.3 Z71 4X4 Stealth Gray Metallic / 2004 Chevy Impala LS 3.8 Cappuccino

    Tow mirrors - Diablew Tuned - Flowmaster Regular 40 - Ready Lift 2.5' lift - BFG LT A/T K/Os - Carr Light Wing - TruckLite LED lights - Optima Red Top - 50% Front Window Tint - Line-X bedliner - Airaid MIT - Tekonsha P2 - ARS Billet Grill - Fia custom fit seat covers

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